<template>
    <div>
        <!-- 顶部滑动条区域 -->
        <div id="slider" class="mui-slider">
				<div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
					<div class="mui-scroll">
						<a :class="['mui-control-item',item.id==0?'mui-active':'']" 
						v-for="item in cates" :key="item.id" @click="getPhotoListByCateId(item.id)">
							{{item.title}}
						</a>               
					</div>
				</div>

			</div>
    <!-- 图片列表区域 -->
	<ul class="photo-list">
		<router-link v-for="item in list" :key="item.id"
		:to="'/home/photoinfo/'+item.id" tag="li">
			<img v-lazy="item.img_url">
			<div class="info">
				<h1 class="info-title">{{item.title}}</h1>
				<span class="info-body">{{item.zhaiyao}}</span>
			</div>
		</router-link>
	</ul>
	
	</div>
</template>
<script>
// 1. 导入mui的js文件
import mui from '../../lib/mui/js/mui.min.js'
import { Toast } from 'mint-ui'

export default {
    data(){
        return{
			cates:[], // 所有分类的列表数组
			list:[] // 图片列表的数组
		}
    },
    mounted(){ 
        // 当组件中的DOM结构被渲染好并放在页面中后，执行这个钩子函数
        // 如果要操作元素了，最好在mounted 里面，因为这里面的DOM元素是最新的
        // 2. 初始化滑动控件
        mui('.mui-scroll-wrapper').scroll({
            deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
        });
	},
	created(){
		this.getAllCategory()
		// 默认进入页面,就主动请求所有图片列表的数据
		this.getPhotoListByCateId(0)
	},
    methods:{
		getAllCategory(){
			this.$http.get('api/getimgcategory').then(result =>{
				if(result.body.status ===0){
					result.body.message.unshift({title: "全部", id: 0})
					this.cates = result.body.message
				}else{
					Toast('获取失败')
				}
			})
		},
		getPhotoListByCateId(cateId){
			// 根据分类Id,获取图片列表
			this.$http.get('api/getimages/'+cateId).then(result =>{
				if(result.body.status === 0){
					this.list = result.body.message
				}else{
					Toast('获取图片失败')
				}
			})
		}
    }
}
</script>
<style lang="scss" scoped>
* {
    touch-action: pan-y;
}

.photo-list{
	margin: 0;
	padding: 10px;
	list-style: none;
	padding-bottom: 0;
	li{
		background-color: #ccc;
		text-align: center;
		margin-bottom: 10px;
		position: relative;
		img{
			width: 100%;
			vertical-align: middle;
			box-shadow: 0 0 9px #ccc;
		}
		img[lazy=loading] {
			width: 40px;
			height: 300px;
			margin: auto;
		}
	}
	.info{
		color: white;
		background-color: rgba(0, 0, 0, 0.4);
		position: absolute;
		bottom: 0;
		text-align: left;
		max-height: 84px;
		.info-title{
			font-size: 16px;
		}
		.info-body{
			font-size: 14px;
		}
	}
}
</style>
